package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import jdk.jshell.MethodSnippet;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Aspect
@Component
public class AutoFillAspect {

    /**
     * 定义切点
     **/
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    /**
     * 前置通知
     **/
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("前置通知...........");
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();// 获取方法签名
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);  // 获取注解
        OperationType operationType = annotation.value();// 获取注解的值

        Object[] args = joinPoint.getArgs(); // 获取参数
        if (args == null || args.length == 0){ // 参数为空
            return;
        }

        Object entity = args[0]; // 获取第一个参数

        // 准备赋值的参数
        LocalDateTime now = LocalDateTime.now();
        Long userId = BaseContext.getCurrentId();

        // 根据当前不同操作进行 对属性进行反射设值
        if (operationType == OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为对象属性复制
                setCreateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,userId);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,userId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为对象属性复制
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,userId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

    }
}
